<template>
  <div class="wrapper">
    <vHead></vHead>
    <vSidebar></vSidebar>
    <div class="content-box" :class="{ 'content-collapse': collapse }">
      <vTags></vTags>
      <div class="content">
        <transition name="move" mode="out-in">
          <keep-alive :include="tagsList">
            <router-view></router-view>
          </keep-alive>
        </transition>
        <el-backtop target=".content"></el-backtop>
      </div>
    </div>
  </div>
</template>

<script>
import vHead from "../components/common/Header.vue";
import vSidebar from "../components/common/Sidebar.vue";
import vTags from "../components/common/Tags.vue";
import bus from "../components/common/bus.js";
export default {
  data() {
    return {
      tagsList: [],
      collapse: false
    };
  },
  components: {
    vHead,
    vSidebar,
    vTags
  },
  created() {
    bus.$on("collapse-content", msg => {
      this.collapse = msg;
    });

    // 只有在标签页列表里的页面才使用keep-alive，即关闭标签之后就不保存到内存中了。
    bus.$on("tags", msg => {
      let arr = [];
      for (let i = 0, len = msg.length; i < len; i++) {
        msg[i].name && arr.push(msg[i].name);
      }
      this.tagsList = arr;
    });
  }
};
</script>

<style scoped>
@import "../assets/css/main.css";
@import "../assets/css/color-dark.css";
</style>
